(function (factory) {  
    if (typeof define === 'function' && define.amd) {  
      // AMD. Register as an anonymous module.  
      define(['jquery'], factory);  
    } else {  
      // Browser globals  
      factory(jQuery);  
    }  
  }(function ($) {  
    $.timeago = function(timestamp) {  
      if (timestamp instanceof Date) {  
        return inWords(timestamp);  
      } else if (typeof timestamp === "string") {  
        return inWords($.timeago.parse(timestamp));  
      } else if (typeof timestamp === "number") {  
        return inWords(new Date(timestamp));  
      } else {  
        return inWords($.timeago.datetime(timestamp));  
      }  
    };  
    var $t = $.timeago;  
    
    $.extend($.timeago, {  
      settings: {  
        refreshMillis: 60000,  
        allowFuture: false,  
        localeTitle: false,  
        cutoff: 0,  
        strings: {  
          prefixAgo: null,  
          prefixFromNow: null,  
          suffixAgo: "前",  
          suffixFromNow: "from now",  
          seconds: "1分钟",  
          minute: "1分钟",  
          minutes: "%d分钟",  
          hour: "1小时",  
          hours: "%d小时",  
          day: "1天",  
          days: "%d天",  
          month: "1月",  
          months: "%d月",  
          year: "1年",  
          years: "%d年",  
          wordSeparator: "",  
          numbers: []  
        }  
      },  
      inWords: function(distanceMillis) {  
        var $l = this.settings.strings;  
        var prefix = $l.prefixAgo;  
        var suffix = $l.suffixAgo;  
        if (this.settings.allowFuture) {  
          if (distanceMillis < 0) {  
            prefix = $l.prefixFromNow;  
            suffix = $l.suffixFromNow;  
          }  
        }  
    
        var seconds = Math.abs(distanceMillis) / 1000;  
        var minutes = seconds / 60;  
        var hours = minutes / 60;  
        var days = hours / 24;  
        var years = days / 365;  
    
        function substitute(stringOrFunction, number) {  
          var string = $.isFunction(stringOrFunction) ? stringOrFunction(number, distanceMillis) : stringOrFunction;  
          var value = ($l.numbers && $l.numbers[number]) || number;  
          return string.replace(/%d/i, value);  
        }  
    
        var words = seconds < 45 && substitute($l.seconds, Math.round(seconds)) ||  
          seconds < 90 && substitute($l.minute, 1) ||  
          minutes < 45 && substitute($l.minutes, Math.round(minutes)) ||  
          minutes < 90 && substitute($l.hour, 1) ||  
          hours < 24 && substitute($l.hours, Math.round(hours)) ||  
          hours < 42 && substitute($l.day, 1) ||  
          days < 30 && substitute($l.days, Math.round(days)) ||  
          days < 45 && substitute($l.month, 1) ||  
          days < 365 && substitute($l.months, Math.round(days / 30)) ||  
          years < 1.5 && substitute($l.year, 1) ||  
          substitute($l.years, Math.round(years));  
    
        var separator = $l.wordSeparator || "";  
        if ($l.wordSeparator === undefined) { separator = " "; }  
        return $.trim([prefix, words, suffix].join(separator));  
      },  
      parse: function(iso8601) {  
        var s = $.trim(iso8601);  
        s = s.replace(/\.\d+/,""); // remove milliseconds  
        s = s.replace(/-/,"/").replace(/-/,"/");  
        s = s.replace(/T/," ").replace(/Z/," UTC");  
        s = s.replace(/([\+\-]\d\d)\:?(\d\d)/," $1$2"); // -04:00 -> -0400  
        return new Date(s);  
      },  
      datetime: function(elem) {  
        var iso8601 = $t.isTime(elem) ? $(elem).attr("datetime") : $(elem).attr("title");  
        return $t.parse(iso8601);  
      },  
      isTime: function(elem) {  
        // jQuery's `is()` doesn't play well with HTML5 in IE  
        return $(elem).get(0).tagName.toLowerCase() === "time"; // $(elem).is("time");  
      }  
    });  
    
    // functions that can be called via $(el).timeago('action')  
    // init is default when no action is given  
    // functions are called with context of a single element  
    var functions = {  
      init: function(){  
        var refresh_el = $.proxy(refresh, this);  
        refresh_el();  
        var $s = $t.settings;  
        if ($s.refreshMillis > 0) {  
          setInterval(refresh_el, $s.refreshMillis);  
        }  
      },  
      update: function(time){  
        $(this).data('timeago', { datetime: $t.parse(time) });  
        refresh.apply(this);  
      },  
      updateFromDOM: function(){  
        $(this).data('timeago', { datetime: $t.parse( $t.isTime(this) ? $(this).attr("datetime") : $(this).attr("title") ) });  
        refresh.apply(this);  
      }  
    };  
    
    $.fn.timeago = function(action, options) {  
      var fn = action ? functions[action] : functions.init;  
      if(!fn){  
        throw new Error("Unknown function name '"+ action +"' for timeago");  
      }  
      // each over objects here and call the requested function  
      this.each(function(){  
        fn.call(this, options);  
      });  
      return this;  
    };  
    
    function refresh() {  
      var data = prepareData(this);  
      var $s = $t.settings;  
    
      if (!isNaN(data.datetime)) {  
        if ( $s.cutoff == 0 || distance(data.datetime) < $s.cutoff) {  
          $(this).text(inWords(data.datetime));  
        }  
      }  
      return this;  
    }  
    
    function prepareData(element) {  
      element = $(element);  
      if (!element.data("timeago")) {  
        element.data("timeago", { datetime: $t.datetime(element) });  
        var text = $.trim(element.text());  
        if ($t.settings.localeTitle) {  
          element.attr("title", element.data('timeago').datetime.toLocaleString());  
        } else if (text.length > 0 && !($t.isTime(element) && element.attr("title"))) {  
          element.attr("title", text);  
        }  
      }  
      return element.data("timeago");  
    }  
    
    function inWords(date) {  
      return $t.inWords(distance(date));  
    }  
    
    function distance(date) {  
      return (new Date().getTime() - date.getTime());  
    }  
    
    // fix for IE6 suckage  
    document.createElement("abbr");  
    document.createElement("time");  
  }));  